Case IH 3141 – Engine Controller (EDC / Engine ECU): Fuel System - High Pressure Pump Is Pumping More Fuel Than Expected

The engine is detecting a discrepancy in the fuel volume flow through the metering unit compared to the calculated limit, or it is experiencing a low fuel supply pressure condition.

• skid steer
• Puma Series (115-240)
• Magnum Series (180-340)
• Maxxum 125
• Steiger 350
• 580N
• 580SN
• SR220
• SR250
• SV250
• SV300
• TR320
• TV380

1. 1

   Inspect Fuel Filters and Water Separator: Check for high restriction or low pressure, specifically inspecting the canister-style water separator filter with the clear top for debris caught inside the built-in check valve.

2. 2

   Check Low-Pressure Fuel Lines: Ensure the low-pressure fuel tubes are not restricted, specifically checking if the return line from the pump to the fuel tank is clogged.

3. 3

   Inspect the Wiring Harness: Check the wiring harness on the left side of the engine for wires chafing inside the protective sheath.

4. 4

   Test the Fuel Pressure Sensor: Check the fuel pressure sensor for accuracy and verify it is reading correctly on the low and high sides.

5. 5

   Test the Fuel Metering Unit: Check the metering unit circuit for electrical defects or sticking.

6. 6

   Check for Leaking Injectors: Perform an injector cut-out test and an injector leak-off test to ensure the injectors are not bypassing excessive fuel back to the return.

1. 1

   Clean/Replace Filters

   Remove the entire water separator filter base, clean out any debris trapped in the check valve, and install new fuel filters.

2. 2

   Repair Wiring

   If chafing is found on the engine wiring harness, repair the damaged wires and re-secure the harness to prevent future rubbing.

3. 3

   Clear Lines

   Blow out or clear the low-pressure fuel return lines if a clog is identified.

4. 4

   Replace Faulty Components

   If the filters and wiring are good, replace the fuel pressure sensor, fuel metering unit (M-Prop/FCA), or leaking fuel injectors based on the results of your diagnostic tests.

5. 5

   Clear Fault Codes

   Connect a compatible diagnostic tool (such as Jaltest or CNH EST) to the machine's diagnostic port to clear code 3141 from the Engine ECU and run a test to confirm the repair.